Some programming languages you might have heard of:

• R
• Matlab
• Python
• JavaScript
• html

Creating variables

baby <- 'Meredith'
sculpture <- 10

baby 

## [1] "Meredith"

sculpture

## [1] 10

• numeric
  • integers, e.g. 1, 2, 3
  • doubles, e.g. 1.25, 3.78
  • complex numbers, e.g. 3 + 2i
• character or string
  • e.g. "Research", "Platforms"
• logical or Boolean
  • e.g. TRUE and FALSE

• vectors / tuples
• matrices / arrays
• lists / structures / data frames
• dictionaries

vector1 <- 1:10
vector2 <- c("learning", "to", "code", "is", "fun")

vector1

##  [1]  1  2  3  4  5  6  7  8  9 10

vector2

## [1] "learning" "to"       "code"     "is"       "fun"

PlatoonLeads <- matrix(
  c("Data Wranglers", 
    "Data Miners",  
    "Cadventurers", 
    "Kerry Halupka", 
    "Kim Doyle",  
    "Louise van der Werff"), 
  ncol=2,
  dimnames=list(NULL,c("platoon","name"))) 

PlatoonLeads

##      platoon          name                  
## [1,] "Data Wranglers" "Kerry Halupka"       
## [2,] "Data Miners"    "Kim Doyle"           
## [3,] "Cadventurers"   "Louise van der Werff"

shoppingList <- list(
  lunch         = c("bread", "cheese", "tomato"),
  dinner        = c("frozen pizza", "chocolate mousse"),
  moneyInWallet = 40.50
)

shoppingList

## $lunch
## [1] "bread"  "cheese" "tomato"
## 
## $dinner
## [1] "frozen pizza"     "chocolate mousse"
## 
## $moneyInWallet
## [1] 40.5

IMDBRatings = {"Game of Thrones": 9.4, 
    "Sherlock": 9.2, 
    "Firefly": 9.1, 
    "Friends": 8.9}

for movie, rating in IMDBRatings.items():
    print movie + ': ' + str(rating)

## Firefly: 9.1
## Friends: 8.9
## Sherlock: 9.2
## Game of Thrones: 9.4

If statements

If statements

hungry <- TRUE

if (hungry){
  print("GIVE ME A TIM TAM!!!")
} else {
  print("No tim tam for me, thanks!")
}

## [1] "GIVE ME A TIM TAM!!!"

If statements

hungry <- FALSE

if (hungry){
  print("GIVE ME A TIM TAM!!!")
} else {
  print("No tim tam for me, thanks!")
}

## [1] "No tim tam for me, thanks!"

For loops

For loops

for (beats in 1:4){
  print("bring left foot to right foot")
  print("step left foot back to original position")
  print("bring right foot to left foot")
  print("step left foot back to original position")
}

## [1] "bring left foot to right foot"
## [1] "step left foot back to original position"
## [1] "bring right foot to left foot"
## [1] "step left foot back to original position"
## [1] "bring left foot to right foot"
## [1] "step left foot back to original position"
## [1] "bring right foot to left foot"
## [1] "step left foot back to original position"
## [1] "bring left foot to right foot"
## [1] "step left foot back to original position"
## [1] "bring right foot to left foot"
## [1] "step left foot back to original position"
## [1] "bring left foot to right foot"
## [1] "step left foot back to original position"
## [1] "bring right foot to left foot"
## [1] "step left foot back to original position"

Functions

Functions

moodCalendar <- function(day){
  if (day %in% c("Friday", "Saturday", "Sunday")){
    print(paste(day, "is a happy day"))
  } else if (day %in% c("Monday", "Tuesday")){
    print(paste(day, "is a grumpy day"))
  } else {
    print(paste(day, "is a neutral day"))
  }}

moodCalendar("Monday")

## [1] "Monday is a grumpy day"

Functions

moodCalendar <- function(day){
  if (day %in% c("Friday", "Saturday", "Sunday")){
    print(paste(day, "is a happy day"))
  } else if (day %in% c("Monday", "Tuesday")){
    print(paste(day, "is a grumpy day"))
  } else {
    print(paste(day, "is a neutral day"))
  }}

moodCalendar("Friday")

## [1] "Friday is a happy day"

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• Coursera Data Science Specialisation